Negative pressure feeding system

Abstract

The utility model relates to a negative pressure feeding system. The automatic feeding device solves the problems that in the prior art, automatic feeding equipment cannot meet the raw material feeding requirements of multiple pieces of production equipment, and raw material spraying waste is caused due to the fact that a pipeline is prone to being exploded due to high pressure. The device comprises a plurality of material bins used for containing materials, the upper ends of the material bins are connected with a material supply device and a negative pressure material suction device through vacuum material barrels respectively, a blowing assembly is arranged on the negative pressure material suction device, and the material supply device is connected with an external feeding bin. The utility model has the advantages that the risk that raw materials are sprayed and wasted due to the fact that the pipeline is exploded due to high pressure is completely eradicated, the raw material supply requirements of a plurality of production devices are met, different types of raw materials can be respectively conveyed to the corresponding devices through flexible pipeline configuration, and the production flexibility and efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of feeding equipment, in particular to a negative pressure feeding system. Background Art

[0002] Currently, the raw materials used in PVC pipe production are mostly dust-like substances. On the production lines of most domestic modified plastics manufacturers, raw material weighing and batching are still performed manually. This manual feeding method undoubtedly brings a series of problems to companies, including high labor intensity, large fluctuations in product quality, severe on-site environmental pollution, and a lack of traceability during the production process. Furthermore, existing automatic feeding equipment cannot meet the raw material supply needs of multiple production facilities, and pipes are prone to bursting due to high pressure, resulting in wasteful material spraying.

[0003] To address the shortcomings of existing technologies, researchers have conducted extensive research and proposed various solutions. For example, a Chinese patent document discloses a fully automatic centralized negative pressure feeding system for PVC powder [CN201711182945.X]. The system includes a conveying pipeline that feeds PVC powder to the high-pressure mixers, a controller for controlling the PVC powder feed rate, a centralized storage device, and several automatic feeders that deliver PVC powder to the high-pressure mixers under vacuum.

[0004] The above solution has solved the problems of high labor intensity and large fluctuations in product quality in the existing technology of manual feeding to a certain extent. However, the solution still has many shortcomings. For example, it is difficult to meet the raw material supply needs of multiple production equipment, and the pipeline is prone to bursting due to high pressure, resulting in waste of raw material spraying. Summary of the Invention

[0005] The purpose of this utility model is to provide a negative pressure feeding system in view of the above problems.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a negative pressure feeding system, comprising several silos for containing materials, the upper ends of the silos are connected to a feeding device and a negative pressure suction device through vacuum cylinders, a purge assembly is provided on the negative pressure suction device, and the feeding device is connected to an external feeding silo.

[0007] In the above-mentioned negative pressure feeding system, the vacuum barrel includes a vacuum barrel discharge valve arranged at the upper end of the silo, the bottom of the vacuum barrel discharge valve is connected to the silo and the upper end of the vacuum barrel is respectively connected to the feed branch pipe and the negative pressure branch pipe.

[0008] In the above-mentioned negative pressure feeding system, the feed branch pipe is connected to the feed main pipe and the external feeding bin; the negative pressure branch pipe is sequentially connected to the negative pressure suction main pipe, the dust collection device, the vacuum breaking valve and the Roots negative pressure blower.

[0009] In the above-mentioned negative pressure feeding system, a vacuum barrel discharge valve is provided on the vacuum barrel suction valve.

[0010] In the above-mentioned negative pressure feeding system, the Roots negative pressure blower is provided with a vacuum breaking valve, and the Roots negative pressure blower is connected to the negative pressure branch pipe through the negative pressure suction main pipe.

[0011] In the above-mentioned negative pressure feeding system, the purge assembly includes a dust collecting device arranged on the negative pressure suction main pipe, and the dust collecting device is provided with a purge assembly.

[0012] In the above-mentioned negative pressure feeding system, a material level sensor is provided under the external feeding bin, and a plurality of three-way valves are provided on the feeding main pipe. Each three-way valve is provided with a switch position sensor, and each three-way valve is connected to a corresponding feeding branch pipe.

[0013] More specifically, each three-way valve is connected by a feeding hose, and the feeding main pipe is connected to an external feeding bin through the feeding hose.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] 1. The negative pressure feeding system completely eliminates the risk of pipeline bursting due to high pressure, resulting in the waste of raw materials.

[0016] 2. The negative pressure feeding system has good sealing and sealing properties, no noise pollution, no dust pollution, which improves the cleanliness and safety of the production environment. At the same time, the dust filtration system filters the dust in the raw materials, which helps to improve the quality of the molded products.

[0017] 3. The negative pressure feeding system can meet the raw material supply needs of multiple production equipment. Through flexible pipeline configuration, different types of raw materials can be delivered to the corresponding equipment separately, improving production flexibility and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a flow chart of the present utility model;

[0020] In the figure: silo 1, vacuum barrel 2, three-way valve 21, feed branch pipe 22, negative pressure branch pipe 23, vacuum barrel suction valve 24, vacuum barrel discharge valve 25, feeding device 3, feeding main pipe 31, three-way valve switch position sensor 32, feeding hose 33, material level sensor 4, Roots negative pressure blower 41, vacuum breaking valve 42, negative pressure suction main pipe 43, purge assembly 5, dust collection device 51, purge valve 52, external feeding bin 6. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0022] like Figure 1-2 As shown, a negative pressure feeding system includes several silos 1 for containing materials. The upper ends of the silos 1 are connected to feeding devices 3 and negative pressure suction devices through vacuum cylinders 2. The negative pressure suction devices are provided with purge components 5, and the feeding devices 3 are connected to external feeding silos 6.

[0023] The vacuum barrel 2 includes a vacuum barrel discharge valve 25 provided at the upper end of the silo 1 . The bottom of the vacuum barrel discharge valve 25 is connected to the silo 1 , and the upper end of the vacuum barrel 2 is respectively connected to a feed branch pipe 22 and a negative pressure branch pipe 23 .

[0024] Furthermore, the feed branch pipe 22 is connected to the feed main pipe 31 and the external feeding bin 6; the negative pressure branch pipe 23 is sequentially connected to the negative pressure suction main pipe 43, the dust collection device 51, the vacuum breaking valve 42 and the Roots negative pressure blower 41.

[0025] Obviously, a vacuum barrel material intake valve 24 is provided on the vacuum barrel material discharge valve 25 .

[0026] It can be seen that the Roots negative pressure blower 41 is provided with a vacuum breaking valve 42 , and the Roots negative pressure blower 41 is connected to the negative pressure branch pipe 23 via the negative pressure material suction main pipe 43 .

[0027] The vacuum breaker valve 42 is opened when discharging materials to prevent the pipe fittings from being damaged due to excessive negative pressure.

[0028] Furthermore, the purge assembly 5 includes a dust collecting device 51 provided on the negative pressure suction main pipe 43 , and the purge assembly 5 is provided on the dust collecting device 51 .

[0029] The purge assembly 5 is used to purge raw material dust accumulated in the filter inside the dust collection device 51 to prevent the dust from entering the Roots negative pressure blower 41 and causing damage.

[0030] Specifically, a material level sensor 4 is provided below the external feeding bin 6 , a plurality of three-way valves 21 are provided on the feeding main pipe 31 , each three-way valve 21 is provided with a switch position sensor 32 , and each three-way valve 21 is connected to a corresponding feeding branch pipe 22 .

[0031] More specifically, each of the three-way valves 21 is connected by a feeding hose 33 , and the feeding main pipe 31 is connected to the external feeding bin 6 via the feeding hose 33 .

[0032] To sum up, the principle of this embodiment is: select the feeding bin 1, then open the three-way valve 21, the three-way valve switch position sensor 32 confirms that the three-way valve 21 is switched to the right position, connects the feed main pipe 31 and the negative pressure suction main pipe 43, starts the Roots negative pressure blower 41 to suck the material, and the material enters the vacuum barrel 2 from the external feeding bin 6 through the feed main pipe 31, the feed hose 33, and the feed branch pipe 22. After feeding to the set time, the vacuum barrel suction valve 24 is closed, the vacuum barrel discharge valve 25 is opened, the vacuum breaking valve 42 is opened, and the bottom of the vacuum barrel 2 starts to discharge the material. After the material in the vacuum barrel 2 is discharged, the suction step continues until the material level sensor 4 of the external feeding bin 6 senses that there is no material and stops sucking the material, stops the Roots negative pressure blower 41, and starts the purge valve 52 of the dust collection device 51.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0034] Although this document frequently uses terms such as silo 1, vacuum barrel 2, three-way valve 21, feed branch pipe 22, negative pressure branch pipe 23, vacuum barrel suction valve 24, vacuum barrel discharge valve 25, feeding device 3, feeding main pipe 31, three-way valve switch position sensor 32, feeding hose 33, material level sensor 4, Roots negative pressure blower 41, vacuum breaker valve 42, negative pressure suction main pipe 43, purge assembly 5, dust collection device 51, purge valve 52, and external feeding bin 6, the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A negative pressure feeding system, comprising a plurality of silos (1) for containing materials, characterized in that: The upper end of the silo (1) is connected to a feeding device (3) and a negative pressure suction device through a vacuum barrel (2), wherein the negative pressure suction device is provided with a purge assembly (5), and the feeding device (3) is connected to an external feeding silo (6).

2. A negative pressure feeding system according to claim 1, characterized in that: The vacuum barrel (2) includes a vacuum barrel discharge valve (25) arranged at the upper end of the silo (1), the bottom of the vacuum barrel discharge valve (25) is connected to the silo (1), and the upper end of the vacuum barrel (2) is respectively connected to a feed branch pipe (22) and a negative pressure branch pipe (23).

3. A negative pressure feeding system according to claim 2, characterized in that: The feed branch pipe (22) is connected to the feed main pipe (31) and the external feeding bin (6); the negative pressure branch pipe (23) is sequentially connected to the negative pressure suction main pipe (43), the dust collection device (51), the vacuum breaking valve (42) and the Roots negative pressure blower (41).

4. A negative pressure feeding system according to claim 2, characterized in that: The vacuum barrel discharge valve (25) is provided with a vacuum barrel suction valve (24).

5. A negative pressure feeding system according to claim 3, characterized in that: The Roots negative pressure blower (41) is provided with a vacuum breaking valve (42), and the Roots negative pressure blower (41) is connected to the negative pressure branch pipe (23) via a negative pressure material suction main pipe (43).

6. A negative pressure feeding system according to claim 5, characterized in that: The purge assembly (5) comprises a dust collecting device (51) arranged on the negative pressure material suction main pipe (43), and the purge assembly (5) is provided on the dust collecting device (51).

7. A negative pressure feeding system according to claim 3, characterized in that: A material level sensor (4) is provided below the external feeding bin (6), a plurality of three-way valves (21) are provided on the feeding main pipe (31), and each three-way valve (21) is provided with a switch position sensor (32), and each three-way valve (21) is connected to a corresponding feeding branch pipe (22).

8. A negative pressure feeding system according to claim 7, characterized in that: Each of the three-way valves (21) is connected by a feeding hose (33), and the feeding main pipe (31) is connected to the external feeding bin (6) through the feeding hose (33).

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